__NOTOC__[[Image:Hach test.jpg|thumb|right|300px|Sample results]][[Image:Pic8.jpg|thumb|right|300px|How to Interpret results]]
Since 1947, Hach Company has manufactured and distributed analytical instruments, test kits, and reagents for testing the quality of water and aqueous solutions, with products for lab, process, and field.
Pathoscreen Medium is a product that tests the quality of water in terms of the presence of certain bacteria: Salmonella, Citrobacter, Proteus, Edwardsiella, and some species of Klebsiella in drinking water, surface water, and recreational waters.
==Construction, operations and maintenance==
[[Image:Hach test.jpg|thumb|right|300px|Sample results]]
[[Image:Pic8.jpg|thumb|right|300px|How to Interpret results]]
The pathoscreen medium comes in pillows (like sachets) with enough powder to test 100ml of water. The sample water is put in sterilized bottles, and the contents of PathoScreen Medium powder pillow is added and left for 24 hours. The change in colour indicates the safety of the water. For more details read the attached document.